http://arxiv.org/abs/2208.11615
The detection of stochastic gravitational wave background (SGWB) is among the leading scientific goals of the space-borne gravitational wave observatory, which would have significant impacts on astrophysics and fundamental physics. In this work, we developed a null channel data analysis software, \texttt{TQSGWB}, which can extract isotropic SGWB using the null channel method based on TianQin detector. We find that for the noise cross spectrum, the oftenly ignored imaginary components in previous studies play an important role in breaking the degeneracy of position noise in the common laser link. We demonstrate that the parameters of various signals and instrumental noise could be estimated directly in the absence of galactic confusion foreground through Markov chain Monte Carlo sampling. With only three-month observation, we find that TianQin could be able to confidently detect SGWBs with energy density as low as $\Omega_{\rm PL} = 1.3 \times 10^{-12}$, $\Omega_{\rm Flat} = 6.0 \times 10^{-12}$, and $\Omega_{\rm SP} = 9.0 \times 10^{-12}$, for power-law, flat, and single peak models respectively.
J. Cheng, E. Li, Y. Hu, et. al.
Fri, 26 Aug 22
23/49
Comments: 16 pages, 8 figures
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